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Arrays in C

This quiz contains question from various concepts related to arrays in C which are perfect to test your understanding of the topic.

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Question 1

Which of the following correctly declares an array of 10 integers in C?

int arr(10);
int arr[10];
array int arr[10];
int[10] arr;

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Question 2

Which of the following statements about arrays is TRUE in C?

Arrays can hold different data types.
The size of an array can be changed during execution.
An array stores elements of the same type in contiguous memory.
Arrays are not supported in C.

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Question 3

What is the index of the first element in a C array?

0
1
-1
Depends on Array.

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Question 4

What is the correct way to initialize all elements of an array to zero in C?

int arr[5] = (0);
int arr[5] = {0};
int arr[5] = 0;
int arr[5] = [0];

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Question 5

Which of the following is NOT a valid array declaration?

int arr[10];
int arr[] = {1, 2, 3};
int arr[3] = {1, 2, 3, 4};
float marks[5];

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Question 6

What is the value of arr[1] after the following declaration?

int arr[3] = {10};

0
10
Garbage Value
Compilation Error.

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Question 7

What is true about partially initialized arrays in C?

All elements must be initialized
Uninitialized elements get garbage values
Remaining elements are initialized to zero
Compiler throws error

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Question 8

Which of the following allows you to iterate over a C array using a pointer?

for (int *p = arr; p <= arr + size; p++)
for (int *p = arr; p < arr + size; p++)
for (int p = arr; p < arr + size; p++)
for (int p = &arr; p <= arr + size; p++)

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Question 9

What is the difference between int arr[5]; and int *arr = malloc(5 * sizeof(int));?

No Difference
The first is static, the second is dynamic
The second doesn't allocate memory
Both use stack memory

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Question 10

What happens if you use sizeof on a pointer to an array?

Gives total array size
Gives size of first element
Gives error
Gives size of pointer

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